Just to play devil's advocate here...
Is this any better than reverie, or ion bolt? Actually, it's probably a little worse offensively, as you can't damage the phased out ship. I have never seen a Marauder in multiplayer.
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It is much better, as it can be used more often and kept up indefinitely. Why focus fire on a unit that isn't doing anything?
Certainly not any better than advent mines.
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This is quite arguable. Also, see end paragrph.
Tec have eco to get ships.
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See end paragraph.
Better than the advent caps support their fleet?
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Yes. Advent caps support each other brilliantly and the fleet quite well. With Vasari, it's the other way around.
More so than a Marza with barrage?
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Arguable, but yes, I think so.
Better than mothership with shield regen? Also, it's scramble bombers ability sucks.
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Not better, but quite useful. They're not the same ability, nor do they have the same application.
Are their turrets any better than anyone else's? And yes, their strikecraft are strong, but they have less of them, so it evens out.
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On paper, sure, but their stronger strikecraft enable them to survive things like Flak Burst and go home to get their Hull Regenerated. Their turrets are as strong as everyone else's, which means they're A LOT stronger late-game with their fleets present at every incursion.
A great ability, but the ship sucks. It's hard to micro, and when enemy fighers are present (which is always), they get slaughtered. On the other hand, the tec robo-cruisers demo-bot ability doesn't need to be micro'd (to achieve a similar effect), and they don't drop like flies in the presence of fighters.
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As it's been said, micro is the Vasari's friend.
Is it better than the tec superweapon?
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Yes. By a mile.
Advent can see anywhere they have culture. Tec scouts have a great ability to put a remote sensor on a planet, and it lasts for a long time.
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Advent can see, in most cases, only the planets they've just lost. Also, the Advent and the TEC don't have the mobility of the Vasari, so they need their scouts to be somewhat more useful.
Tec robo-cruisers are better - they repair everything, are cheap, etc.
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Not the same ship, and no amount of robo-cruising is going to help against focus fire from a moderately large fleet.
Tec has a similar area of affect ability.
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Similar, sure. But not as effective. The Vasari get to cover their disabling warp-in support cruisers in the front lines from the rear lines.
Again, just playing devil's advocate.
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Play all you want, but then someone's gotta respond...
Most of the comparisons you drew compare the Vasari to both TEC and Advent. Think about that.